Digital Circuits-8-Bit Microprocessor (8085) [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 1 - 4 of 68

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Question 1

8-Bit Microprocessor (8085)
Architecture

Appeared in Year: 1997

Question

MCQ▾

The following instructions have been executed by an 8085 microprocessor, from which address will the next instruction be fetched?

Table Showing the Address and Instructions Are Given for the Question
ADDRESSINSTRUCTION
6010LXI H, 8A, 79 H
6013MOV A, L
6015ADD H
6016DAA
6017MOV H, A
6018PCHL

Choices

Choice (4)Response

a.

6979

b.

6019

c.

6379

d.

None of the above

Question 2

8-Bit Microprocessor (8085)
Architecture

Appeared in Year: 2003

Question

MCQ▾

In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B. As a result

Choices

Choice (4)Response

a.

Carry flag and Zero flag will be rest

b.

Carry flag and Zero flag will be set

c.

Carry flag will be set but Zero flag will be reset

d.

Carry flag will be rest but Zero flag will be set

Question 3

8-Bit Microprocessor (8085)
Programming

Appeared in Year: 2010

Question

MCQ▾

For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is

  1. 3000MVIA, 45H
  2. 3002MOVB, A
  3. 3003STC
  4. 3004CMC
  5. 3005RAR
  6. 3006XRAB

Choices

Choice (4)Response

a.

67H

b.

00H

c.

E7H

d.

45H

Question 4

8-Bit Microprocessor (8085)
Programming

Appeared in Year: 2004

Question

MCQ▾

Consider the sequence of 8085 instructions given below

  1. LXIH, 9258
  2. MOVA, M
  3. CMA
  4. MOVM, A

Which one of the following is performed by this sequence?

Choices

Choice (4)Response

a.

Contents of location 5892 are complemented and stored in location 5892

b.

Contents of location 8529 are complemented and stored in location 8529

c.

Contents of location 9258 are moved to the accumulator

d.

Contents of location 9258 are compared with the contents of the accumulator

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